Musnad Ahmad 33:1007

Hashim ibn al-Qasim narrated to us, from Ibn Abi Dhi'b, from Sharhabil ibn Sa'd, from Jabir ibn Abdullah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "For one of you to restrain his hand from the pebbles is better for him than having one hundred she-camels, all of them with black pupils. If one of you is overcome by the Shaytan, then let him perform one single wiping."